8.7: Lab Exercise (Part B and C)

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Part B - Igneous Rock Texture

For this exercise, you will determine the texture and rate of cooling for the igneous rock samples in your HOL kit. Refer to Figures 8.6 through 8.9 for guidance.

18. Sample I1 has what texture?

a. phaneritic

b. aphanitic

c. porphyritic-aphanitic

d. glassy

19. How did Sample I1 form?

a. by magma that cooled slowly

b. by fast cooling lava

c. by a very fast cooling of lava

d. by a very fast cooling magma during a volcanic eruption

e. by magma that was cooling slowly, then as lava that cooled quickly

20. Sample I1 is called______________.

a. obsidian

b. pumice

c. granite

d. rhyolite

e. diorite

f. andesite

g. gabbro

h. basalt

21. Sample I1 can also be called ___________.

a. volcanic

b. plutonic

22. Sample I2 has what texture?

a. phaneritic

b. aphanitic

c. porphyritic-aphanitic

d. glassy

23. How did Sample I2 form?

a. by magma that cooled slowly

b. by fast cooling lava

c. by a very fast cooling of lava

d. by a very fast cooling magma during a volcanic eruption

e. by magma that was cooling slowly, then as lava that cooled quickly

24. Sample I2 is called______________.

a. obsidian

b. pumice

c. granite

d. rhyolite

e. diorite

f. andesite

g. gabbro

h. basalt

25. Sample I2 can also be called ____________.

a. volcanic

b. plutonic

26. Sample I3 has what texture?

a. phaneritic

b. aphanitic

c. porphyritic-aphanitic

d. glassy

27. How did Sample I3 form?

a. by magma that cooled slowly

b. by fast cooling lava

c. by a very fast cooling of lava

d. by a very fast cooling magma during a volcanic eruption

e. by magma that was cooling slowly, then as lava that cooled quickly

28. Sample I3 is called______________.

a. obsidian

b. pumice

c. granite

d. rhyolite

e. diorite

f. andesite

g. gabbro

h. basalt

29. Sample I3 can also be called __________.

a. volcanic

b. plutonic

30. Sample I4 has what texture?

a. phaneritic

b. aphanitic

c. porphyritic-aphanitic

d. glassy

31. How did Sample I4 form?

a. by magma that cooled slowly

b. by fast cooling lava

c. by a very fast cooling of lava

d. by a very fast cooling magma during a volcanic eruption

e. by magma that was cooling slowly, then as lava that cooled quickly

32. Sample I4 is called______________.

a. obsidian

b. pumice

c. granite

d. rhyolite

e. diorite

f. andesite

g. gabbro

h. basalt

33. Sample I4 can also be called __________.

a. volcanic

b. plutonic

34. Sample I5 has what texture?

a. phaneritic

b. aphanitic

c. porphyritic-aphanitic

d. glassy

35. How did Sample I5 form?

a. by magma that cooled slowly

b. by fast cooling lava

c. by a very fast cooling of lava

d. by a very fast cooling magma during a volcanic eruption

e. by magma that was cooling slowly, then as lava that cooled quickly

36. Sample I5 is called______________.

a. obsidian

b. pumice

c. granite

d. rhyolite

e. diorite

f. andesite

g. gabbro

h. basalt

37. Sample I5 can also be called __________.

a. volcanic

b. plutonic

38. Sample I6 has what texture?

a. phaneritic

b. aphanitic

c. porphyritic-aphanitic

d. glassy

39. Sample I6 has what composition?

a. felsic

b. intermediate

c. mafic

d. any of the above

40. How did Sample I6 form?

a. by magma that cooled slowly

b. by fast cooling lava

c. by a very fast cooling of lava

d. by a very fast cooling magma during a volcanic eruption

e. by magma that was cooling slowly, then as lava that cooled quickly

41. Sample I6 is called_________.

a. obsidian

b. pumice

c. granite

d. rhyolite

e. diorite

f. andesite

g. gabbro

h. basalt

42. Sample I7 has what texture?

a. phaneritic

b. aphanitic

c. porphyritic-aphanitic

d. glassy

43. How did Sample I7 form?

a. by magma that cooled slowly

b. by fast cooling lava

c. by a very fast cooling of lava

d. by a very fast cooling magma during a volcanic eruption

e. by magma that was cooling slowly, then as lava that cooled quickly

44. Sample I7 is called______________.

a. obsidian

b. pumice

c. granite

d. rhyolite

e. diorite

f. andesite

g. gabbro

h. basalt

45. Sample I7 can also be called ___________.

a. volcanic

b. plutonic

46. Sample I8 has what texture?

a. phaneritic

b. aphanitic

c. porphyritic-aphanitic

d. glassy

47. How did Sample I8 form?

a. by magma that cooled slowly

b. by fast cooling lava

c. by a very fast cooling of lava

d. by a very fast cooling magma during a volcanic eruption

e. by magma that was cooling slowly, then as lava that cooled quickly

48. Sample I8 is called______________.

a. obsidian

b. pumice

c. granite

d. rhyolite

e. diorite

f. andesite

g. gabbro

h. basalt

49. Sample I8 can also be called ___________.

a. volcanic

b. plutonic

Part C - Google Earth

Igneous intrusions such as plutons are large magma bodies that have crystallized into solid rock. Regional uplift and erosion of the earth’s surface can expose portions of these plutons, and large exposures that are over 100 km2 are called batholiths, and a small portion (less than 100 km2 ) of a pluton exposed at the earth’s surface is called a stock. The following exercises require that you use Google Earth.

50. Type the following coordinates into the search bar in Google Earth: 33 48 14.24 N 84 08 44.31 W. This is Stone Mountain, GA. Zoom in to an eye elevation of ~2400 ft for a closer look. Based on the color, and assuming no color change has occurred due to weathering at this location, what is the composition of rock?

a. ultramafic

b. mafic

c. intermediate

d. felsic

51. Zoom out to an eye elevation of ~1500 ft so that you can see the entire mountain. Click on the ruler icon to open up the ruler function. Select the Line tab, and change the map length to kilometers. What is the longest length of the exposed portion of Stone Mountain?

a. 3000 km

b. 260 km

c. 6 km

d. 2.6 km

52. Based on your measurement of the longest dimension, Stone Mountain can be classified as:

a. a batholith

b. a stock

53. Type the following coordinates into the search bar in Google Earth: 64 58 45.54 N 16 43 07.04 W. Zoom in to an eye elevation of ~12979 ft for a closer look. Based on the color, what is the composition of this rock?

a. ultramafic

b. mafic

c. intermediate

d. felsic

54. Zoom out to an eye elevation of 41,566 ft. Based on the proximity of the volcanic crater (now containing a lake), the igneous rocks identified in question 53 are:

a. extrusive

b. intrusive